CN104375000A - Calculation method for statistic line losses - Google Patents
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- CN104375000A CN104375000A CN201410659095.8A CN201410659095A CN104375000A CN 104375000 A CN104375000 A CN 104375000A CN 201410659095 A CN201410659095 A CN 201410659095A CN 104375000 A CN104375000 A CN 104375000A
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Abstract
The invention provides a calculation method for statistic line losses. The method comprises the step of judging whether position-switched electric energy meters exist in all electric energy meters of user sides connected to a distributing line to be measured in a current acquisition cycle, the step of calculating statistic line loss contributions made by the position-switched electric energy meters to the distributing line to be measured in the current acquisition cycle, and the step of subtracting the statistic line loss contributions made by the position-switched electric energy meters to the distributing line to be measured in the current acquisition cycle and electric energy differences of non-position-switched electric energy meters in the current acquisition cycle from an electric energy difference of a total electric energy meter in the current acquisition cycle, dividing the final difference value by the electric energy difference of the total electric energy meter in the current acquisition cycle, and determining the obtained calculation result as the statistic line losses of the distributing line to be measured in the current acquisition cycle. Influences, caused by position switching of the electric energy meters among different distributing lines, on statistic line loss calculation are fully considered, the accuracy rate of the calculation result is high, the line loss management level is improved easily, and a reliable data support is provided for economical operation of a power system.
Description
Technical field
The present invention relates to technical field of electric power, particularly, relate to a kind of computing method of statistical line losses.
Background technology
Line loss is the active power loss and energy loss that produce in power network transmission assigning process.Statistical line losses is the line loss calculated according to electric energy meter index.
Line loss is necessary problems faced in Operation of Electric Systems process, and the management of line loss is significant to realizing Economical Operation of Power Systems.Say from State-level, strengthen Controlling line loss, national energy resource can be saved, the Major Strategic sex work that response national energy-saving reduces discharging; From electrical network aspect, strengthen Controlling line loss and can effectively reduce electrical network electric energy loss, reduce electrical energy production transmission cost.Particularly for the area of some electricity shortage, the reinforcement of Controlling line loss can alleviate energy shortage problem to a certain extent, promote national economy continue, coordinate, steady development.
Within 2008, state's net is proposed unified sales service management system (SG186), and the management of unified standard has been carried out in the miscellaneous service process in sales department and basic data, and object is intended to make sales department to standardization, Normalization.But, data in SG186 system are mostly from power user power consumption information acquisition system, this system only can obtain the related data at stoichiometric point place, but when the calculating of statistical line losses, except needing to obtain except the data message at each stoichiometric point place, also need state and the platform district information of learning each switch in current line.Therefore current SG186 system cannot realize carrying out automatically, exactly calculating to Line Loss of Distribution Network System.
When current dependence SG186 system and acquiring electric energy information system-computed statistical line losses, be only that the electric energy meter data of collection point are are simply added and subtracted, do not consider that the distribution line that the factors such as the change of Yin Tai district and dual power supply cause changes impact statistical line losses being calculated to generation.
(1) platform district situation about changing
Such as shown in Fig. 1, platform district 1 covers electric energy meter M1,10kv distribution line 1 and the section of checking meter 1, and electric energy meter M1 is total electric energy meter that 10kv distribution line 1 transformer terminal connects; Platform district 2 covers electric energy meter M2,10kv distribution line 2 and the section of checking meter 2, and electric energy meter M2 is total electric energy meter that 10kv distribution line 2 transformer terminal connects; M3, M4, M5, M6, M7, M8, M9, M10 are respectively the electric energy meter of user side, and wherein, the section of checking meter 1 covers M3, M4, M5, M6, and the section of checking meter 2 covers M7, M8, M9, M10.
Counting statistics line loss need gather the electric energy meter data of each user side, and suppose that the electric energy meter difference of each user side in a collection period is respectively △ M3, △ M4, △ M5, △ M6, △ M7, △ M8, △ M9, △ M10, prior art is directly by δ
1the situation that platform district during this changes as the statistical line losses of the 10kV distribution line 1 in this collection period Nei Tai district 1, but is not considered by=[△ M1-△ M3-△ M4-△ M5-△ M6]/△ M1.Such as M6 place subscriber's line certain moment is during this period switched to platform district 2 from platform district 1, is changed to the section of checking meter 2 from the section of checking meter 1, at this moment whole electricity of M6 is participated in computer board district 1 line loss and result will be caused inaccurate.
(2) situation of dual power supply
Such as shown in Fig. 2,10kv distribution line 1 and 10kv distribution line 2 are jointly for user side is powered.The electric energy meter of user side is respectively M3, M4, M5, and under normal circumstances, S1, S2, S3 are in closure state, and S4 is in off-state, is powered by distribution line 1.When electric energy meter M1 side line failure, can disconnect S1, closed S4, switches to and is powered by 10kv distribution line 2.
Suppose before and after a collection period, the electric energy difference of total electric energy meter M1 that 10kv distribution line 1 connects is △ M1, and the electric energy difference of electric energy meter M3, M4, M5 is respectively △ M3, △ M4, △ M5, and prior art is directly by δ
1=[△ M1-△ M3-△ M4-△ M5]/△ M1 is as the statistical line losses of 10kV distribution line 1 in this collection period.Visible existing computing method are not considered the multiple method of operation, and only carry out simple statistical line losses calculating for primary power, when the circuit method of operation changes, its result and actual value differ greatly.
To sum up, for 10kV power distribution network, due to problems such as dual power supply, platform district adjustment confusions, often there is very large deviation with actual conditions in the line loss electricity added up in power grid enterprises' dedicated system and line loss per unit, this carries out Controlling line loss work not only bad for power grid enterprises, also can cause adverse effect to the optimizing operation of electrical network.
Summary of the invention
The fundamental purpose of the embodiment of the present invention is the computing method providing a kind of statistical line losses, to solve existing statistical line losses technology because not considering that the distribution lines such as the change of platform district and dual power supply change factor, causes the inaccurate problem of result of calculation.
To achieve these goals, the embodiment of the present invention provides a kind of computing method of statistical line losses, comprising:
Judge in all electric energy meters of the user side be connected with distribution line to be measured in current collection period, whether there is electric energy meter position occurring between this distribution line to be measured and other distribution lines and switches;
If, then between this distribution line to be measured and other distribution lines, there is the electric energy meter that position switches be defined as switching electric energy meter by described, and be defined as non-switching electric energy meter by not there is not the electric energy meter that position switches between this distribution line to be measured and other distribution lines;
Determine the electric energy difference of described switching electric energy meter at current collection period, and determine the operating time of described switching electric energy meter in this distribution line to be measured in current collection period;
Calculate the operating time of described switching electric energy meter in this distribution line to be measured and the ratio of the total duration of current collection period, be multiplied by the electric energy difference of described switching electric energy meter at current collection period again, the result of calculation obtained be defined as described switching electric energy meter and at current collection period, the statistical line losses of this distribution line to be measured contributed;
Determine the electric energy difference of described non-switching electric energy meter at current collection period;
Determine the electric energy difference of total electric energy meter at current collection period of this distribution line transformer terminal connection to be measured;
Calculate described total electric energy meter and deduct described switching electric energy meter at current collection period to the contribution of the statistical line losses of this distribution line to be measured and deduct the electric energy difference of described non-switching electric energy meter at current collection period in the electric energy difference of current collection period, again divided by the electric energy difference of described total electric energy meter at current collection period, the result of calculation obtained is defined as the statistical line losses of this distribution line to be measured at current collection period.
By means of technique scheme, the present invention has taken into full account when counting statistics line loss the situation that electric energy meter switches between different distribution line, for switching electric energy meter, according to its working time in distribution line to be measured, calculate it and treat the statistical line losses contribution being measured electric line, compared to prior art, the present invention has taken into full account that this part electric energy meter switches between different distribution line and has calculated on statistical line losses the impact caused, result of calculation accuracy rate is high, be conducive to improving Controlling line loss level, for Economical Operation of Power Systems provides reliable Data support.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the distribution line structural representation that provided by the invention district changes;
Fig. 2 is the distribution line structural representation of dual power supply provided by the invention;
Fig. 3 is the computing method schematic flow sheet of statistical line losses provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of computing method of statistical line losses, as shown in Figure 3, the method comprises:
Step S31, judges in all electric energy meters of the user side be connected with distribution line to be measured in current collection period, whether there is electric energy meter position occurring between this distribution line to be measured and other distribution lines and switches, if so, then execution step S32.
Concrete, certain distribution line can connect the electric energy meter of a lot of user sides in a collection period, but when counting statistics line loss, some electric energy meter wherein may switch on other distribution lines, or some electric energy meter wherein switches from other distribution lines comes, the present invention has taken into full account that the position of this part electric energy meter between different distribution line switches and has calculated on statistical line losses the impact caused.
In a kind of preferred embodiment, this step S31 specifically can pass through sales service management system SG186, obtains the annexation of electric energy meter and distribution line to be measured in current collection period; And judge in all electric energy meters of the user side that this distribution line to be measured connects in current collection period according to annexation, whether there is electric energy meter position occurring and switches.
Sales service is divided into by SG186 system " customer service and customer relationship ", " electricity bill control ", 4 business scopes and " integrated management " such as " electric energy metrical and information acquisition " and " market and Demand-side ".Be divided into new clothes increase-volume and change electricity consumption, management of checking meter, accounting management, electric fees charging and financial management, Controlling line loss, stoichiometric point management, asset management, measuring system management, acquiring electric energy information, contract for the supply and use of electricity management, power utility check management, customer relation management, client contact, market management, 95598 business processing, ordered electric management, energy efficiency management, inspection and work quality, customer profile data management etc., totally 19 service class, 137 traffic items and 753 business subitems.System is shared out the work and helped one another by the concrete business in each field, for client provides all kinds of service, completes all kinds of business processing, for the management of power supply enterprise, operation and decision-making provide support; , cooperated with the orderly of other business by sales service meanwhile, can further improve the sharing degree of whole power grid enterprises resource.
Can be called in national grid database about the information of circuit and data by SG186 system.Logging in SG186 system homepage, by checking the Back ground Information of transformer station, circuit, Tai Qu, the Electricity customers section of checking meter, confirming the corresponding relation in transformer station, circuit, platform interval, confirm the corresponding relation of circuit and the section of checking meter, platform district and the section of checking meter; In line loss administration module, the information such as line loss Basic Information Management, examination Single Component Management, line loss managing electric quantity, line loss statistics, line loss exception management can be checked.
Step S32, is defined as switching electric energy meter by there is the electric energy meter that position switches between this distribution line to be measured and other distribution lines, and is defined as non-switching electric energy meter by not there is not the electric energy meter that position switches between this distribution line to be measured and other distribution lines.
Concrete, if in current collection period, distribution line to be measured connect all electric energy meters of user side, all between this distribution line to be measured and other distribution lines, not there is not position to switch, then in current collection period, distribution line connect user side all electric energy meters be all confirmed as non-switching electric energy meter.
Step S33, determines to switch the electric energy difference of electric energy meter at current collection period, and determines to switch the operating time of electric energy meter in this distribution line to be measured in current collection period.
Concrete, electric energy difference is the data of collection period finish time electric energy meter and the difference of collection period start time electric energy meter data.
In a kind of preferred embodiment, this step S33 specifically can pass through distribution automation system, obtains in current collection period and switches the operating time of electric energy meter in this distribution line to be measured.
The original intention that distribution automation system proposes is, improves electric power enterprise to the controling power of bulk power grid, strengthens the management level that troop is specialized, intensive.This system utilizes computing machine, communication and information technology, effectively carries out automatic management to power distribution network real time execution, electric network composition, equipment, user, while raising power supply quality and the efficiency of management, significantly decreases the demand to bottom manpower.The task of distribution system automation mainly comprises: integrated SCADA and GIS function; Distribution management system; Outage Management Systems; Demand Side Response; Dispatching automation function; Distributed power generation manages.Distribution automation system is generally by following a few part: distribution main website, distribution substation (set up in transformer station, can match), distribution terminal unit (FTU, DTU, TTU etc.) and communication network.Under normal circumstances, distribution automation system can realize measuring a distant place for each operation electrical parameter various electricity of built-in unit (comprise feedback), to monitor and a distant place for equipment state controls.
In the status surveillance, event logging module of distribution automation system, search the communication information, load transfer plan information and accident report archive information, in conjunction with the circuit diagram of distribution line, position and running time, the state of cut-offfing of dual power supply two-termial line and the running time of the operation of Tiao Tai district can be calculated, draw the circuit diagram of each line status.In conjunction with information such as SG186 system and acquiring electric energy information system Zhong Tai district, electric fluxs, obtain the working time of each line status, obtain the data such as the electricity that electric energy meter works respectively under each line status, in order to calculate the loss on every bar distribution line.
Step S34, calculate and switch the operating time of electric energy meter in this distribution line to be measured and the ratio of the total duration of current collection period, be multiplied by again and switch the electric energy difference of electric energy meter at current collection period, the result of calculation obtained is defined as switch electric energy meter and at current collection period, the statistical line losses of this distribution line to be measured is contributed.
Concrete, the present invention is directed to switching electric energy meter, according to its working time in this distribution line to be measured, calculate the contribution of its statistical line losses to this distribution line to be measured, fully demonstrated contemplated by the invention and switch the position of electric energy meter between different distribution line and switch the impact caused is calculated on statistical line losses.
Step S35, determines the electric energy difference of non-switching electric energy meter at current collection period.
Concrete, because non-switching electric energy meter is only connected with this distribution line to be measured in current collection period, and be not switched to other distribution lines and get on, therefore only need to consider the electric energy difference of non-switching electric energy meter at current collection period.
Step S36, determines the electric energy difference of total electric energy meter at current collection period of this distribution line transformer terminal connection to be measured.
Step S37, calculate total electric energy meter to deduct in the electric energy difference of current collection period and switch electric energy meter at current collection period to the contribution of the statistical line losses of this distribution line to be measured and deduct the electric energy difference of non-switching electric energy meter at current collection period, again divided by the electric energy difference of total electric energy meter at current collection period, the result of calculation obtained is defined as the statistical line losses of this distribution line to be measured at current collection period.
The present invention has taken into full account the electric energy meter situation that position switches between different distribution line when counting statistics line loss, for switching electric energy meter, according to its working time in distribution line to be measured, calculate it and treat the statistical line losses contribution being measured electric line, compared to prior art, the present invention has taken into full account that this part electric energy meter switches between different distribution line and has calculated on statistical line losses the impact caused, result of calculation accuracy rate is high, be conducive to improving Controlling line loss level, for Economical Operation of Power Systems provides reliable data supporting.
In a kind of preferred embodiment, the present invention can pass through power user power consumption information acquisition system, determines start time and the end time of current collection period.
For ensureing that the specification of intelligent grid construction is carried out, national grid was proposed power user power consumption information acquisition system in 2008.This system is by setting up unified main website, acquisition terminal, communication unit, unified and standard form structure, performance index, communication protocol, safety certification, operation management etc., measuring apparatus on-line monitoring can be realized, the automatic collection of power consumer important information (electricity, voltage, electric current etc.).As the main information provider of " SG186 " system, information acquisition system can in time, accurately, intactly for SG186 infosystem provides basic data, for company manager each process of operation is analyzed, decision-making provides effective support.
Through high speed development in a few years, power information acquisition system can realize " all standing, full collection " to some areas power information, and the automaticity of the business such as electric energy metrical, automatic data logging, pre-payment management have also been obtained remarkable lifting.For enterprise realize intensive, lean further, standardized management lays a good foundation.
Log in acquiring electric energy information system, in power information collection and real-time monitoring module, search the data such as total electric flux, voltage, electric current, active power, reactive power, power factor at each collection point place.According to different acquisition point to the requirement of image data, confirm the information such as acquisition target, image data item, collection period, execution priority, collection beginning and ending time, and manage the execution of various acquisition tasks, check tasks carrying situation.
Embodiment one
As shown in Figure 1, in a certain collection period, because distribution line changes, electric energy meter M6 is switched to platform district 2 from platform district 1, namely 10kv distribution line 2 is switched to from 10kv distribution line 1, if in this collection period, the time that electric energy meter M6 works in platform district 1 is T1, the time worked in platform district 2 is T2, and before and after this collection period, the electric energy difference of total electric energy meter M1 is △ M1, and the electric energy difference of electric energy meter M3, M4, M5, M6 is respectively the statistical line losses δ in △ M3, △ M4, △ M5, △ M6, Ze Tai district 1 (10kv distribution line 1)
1for:
δ
1＝[△M1-△M3-△M4-△M5-△M6×T1/(T1+T2)]/△M1
Embodiment two
As shown in Figure 2, under normal circumstances, S1, S2, S3 are in closure state, and S4 is in off-state, are powered by distribution line 1.In a certain collection period, 10kv distribution line 1 breaks down, S1 disconnects, S2, S3, S4 are closed, powered separately by 10kv distribution line 2, suppose in this collection period, electric energy meter M3, M4, M5 of user side are T1 in the working time of 10kv distribution line 1, be T2 in the working time of 10kv distribution line 2, and before and after this collection period, the electric energy difference of total electric energy meter M1 that 10kv distribution line 1 connects is △ M1, and the electric energy difference of electric energy meter M3, M4, M5 is respectively △ M3, △ M4, △ M5, then the statistical line losses δ of 10kv distribution line 1
1for:
δ
1＝[△M1–(△M3+△M4+△M5)×T1/(T1+T2)]/△M1
Line loss is necessary problems faced in Operation of Electric Systems process, and the management of line loss is significant to realizing Economical Operation of Power Systems.Say from State-level, strengthen Controlling line loss, national energy resource can be saved, the Major Strategic sex work that response national energy-saving reduces discharging; From electrical network aspect, strengthen Controlling line loss and can effectively reduce electrical network electric energy loss, reduce electrical energy production transmission cost.Particularly for the area of some electricity shortage, the reinforcement of Controlling line loss can alleviate energy shortage problem to a certain extent, promote national economy continue, coordinate, steady development.
Current, also there are problems in grid line loss management work, and Controlling line loss level has much room for improvement.Particularly in the power distribution network of town and country, because electric power meter is accurate not, the problems such as Controlling line loss consciousness is thin, a lot of local Controlling line loss level is also relatively backward.For 10kV power distribution network, due to problems such as dual power supply, platform district adjustment confusions, often there is very large deviation with actual conditions in the line loss electricity added up in power grid enterprises' dedicated system and line loss per unit, this carries out Controlling line loss work not only bad for power grid enterprises, also can cause adverse effect to the optimizing operation of electrical network.
The computing method of the statistical line losses that the present invention proposes are a kind of methods of integrated application SG186 system, data acquisition system (DAS), distribution automation system counting statistics line loss, each system information can be integrated, effectively avoid the not statistical uncertainty true problem of line loss caused in practical operation, improve Controlling line loss level, for Economical Operation of Power Systems provides reliable Data support.
Above specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; these are only specific embodiments of the invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. computing method for statistical line losses, is characterized in that, comprising:
Judge in all electric energy meters of the user side be connected with distribution line to be measured in current collection period, whether there is electric energy meter position occurring between this distribution line to be measured and other distribution lines and switches;
If, then between this distribution line to be measured and other distribution lines, there is the electric energy meter that position switches be defined as switching electric energy meter by described, and be defined as non-switching electric energy meter by not there is not the electric energy meter that position switches between this distribution line to be measured and other distribution lines;
Determine the electric energy difference of described switching electric energy meter at current collection period, and determine the operating time of described switching electric energy meter in this distribution line to be measured in current collection period;
Calculate the operating time of described switching electric energy meter in this distribution line to be measured and the ratio of the total duration of current collection period, be multiplied by the electric energy difference of described switching electric energy meter at current collection period again, the result of calculation obtained be defined as described switching electric energy meter and at current collection period, the statistical line losses of this distribution line to be measured contributed;
Determine the electric energy difference of described non-switching electric energy meter at current collection period;
Determine the electric energy difference of total electric energy meter at current collection period of this distribution line transformer terminal connection to be measured;
Calculate described total electric energy meter and deduct described switching electric energy meter at current collection period to the contribution of the statistical line losses of this distribution line to be measured and deduct the electric energy difference of described non-switching electric energy meter at current collection period in the electric energy difference of current collection period, again divided by the electric energy difference of described total electric energy meter at current collection period, the result of calculation obtained is defined as the statistical line losses of this distribution line to be measured at current collection period.
2. the computing method of statistical line losses according to claim 1, is characterized in that, also comprise:
By sales service management system SG186, obtain the annexation of electric energy meter and distribution line in current collection period;
Judge according to described annexation in all electric energy meters of the user side that distribution line to be measured with this is connected in current collection period, whether there is electric energy meter position occurring between this distribution line to be measured and other distribution lines and switches.
3. the computing method of statistical line losses according to claim 1, is characterized in that, also comprise:
By distribution automation system, obtain the operating time of described switching electric energy meter in this distribution line to be measured in current collection period.
4. the computing method of statistical line losses according to claim 1, is characterized in that, also comprise:
By power user power consumption information acquisition system, determine start time and the end time of current collection period.
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| CN111443305A (en) * | 2018-12-27 | 2020-07-24 | 贵州中烟工业有限责任公司 | Method and device for detecting line fault by using electric energy deviation value |
| CN113189447A (en) * | 2021-04-29 | 2021-07-30 | 南方电网电力科技股份有限公司 | Feeder fault detection method, system and equipment based on Bayesian network |
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| CN104375000B (en) | 2017-05-03 |
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